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Publication numberUS4690722 A
Publication typeGrant
Application numberUS 06/923,030
Publication dateSep 1, 1987
Filing dateOct 24, 1986
Priority dateOct 24, 1986
Fee statusLapsed
Also published asDE3734855A1, DE3734855C2
Publication number06923030, 923030, US 4690722 A, US 4690722A, US-A-4690722, US4690722 A, US4690722A
InventorsGary N. Flood
Original AssigneeBranson Ultrasonics Corporation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Two or more juxtaposed layers; textiles
US 4690722 A
Abstract
An apparatus for joining sheet material and cutting joined material comprises a set of drums rotating against one another. A first drum is provided along its surface with a raised pattern serving as welding surfaces when operating in conjunction with one or more ultrasonic resonators. As sheet material is fed through the nip formed between the drum and the resonator, the material is joined in accordance with the pattern. A second drum is provided along its surface with a complementary raised pattern of cutting surfaces. As the material subsequently is fed through the nip between both drums, the welded portions are severed from the surrounding material. The welding and cutting pattern surfaces are constructed to mesh for providing positive severing of the material interposed therebetween.
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Claims(6)
What is claimed is:
1. An apparatus for joining two or more juxtaposed layers of sheet material, at least one of said layers containing thermoplastic material, in accordance with a desired pattern, comprising:
a first rotatably mounted drum having a pattern of raised welding surfaces along its surface, said pattern corresponding to the desired pattern;
a second rotatably mounted drum having along its surface a pattern of raised cutting surfaces corresponding at least in part to said pattern of welding surfaces, said second drum mounted in facing relationship with said first drum for providing therebetween a nip for feeding sheet material therethrough responsive to the rotation of said drums whereby sequentially portions of said cutting surfaces are disposed in confronting relationship with respective portions of said welding surfaces;
a resonator capable of providing vibrations in the ultrasonic frequency range at an output surface thereof mounted for causing said output surface and first drum to form a nip through which the layers of juxtaposed sheet material are fed responsive to the rotation of said first drum,
whereby when said resonator is rendered resonant and urged toward said pattern of welding surfaces and the sheet material is fed through the nip between said output surface and said first drum the juxtaposed layers are welded to one another in accordance with the pattern of welding surfaces and when the material is fed through the nip between said first drum and second drum the welded layers are severed in accordance with the pattern of cutting surfaces of said second drum.
2. An apparatus as set forth in claim 1, and means for rotating said drums in synchronism.
3. An apparatus as set forth in claim 1, said resonator being blade shaped.
4. An apparatus as set forth in claim 1, said welding surfaces being provided with a groove, and said cutting surfaces engaging said groove for causing severance of the welded layers of sheet material.
5. An apparatus as set forth in claim 4, said raised welding surfaces including a flat upper surface, said groove being disposed substantially centrally along the width of said flat surface.
6. An apparatus as set forth in claim 1, said sheet material being fed first through the nip between said output surface and said first drum, then around a portion of said first drum, and then through the nip between said first and second drums.
Description
SUMMARY OF THE INVENTION

This invention relates to joining two or more juxtaposed layers of sheet material, at least one of the layers containing thermoplastic material, by ultrasonic energy and, more specifically, refers to an apparatus for joining such sheet material in accordance with a desired pattern and subsequently severing the joined material from the surrounding material.

Quite specifically, this invention concerns an apparatus for ultrasonically joining two or more juxtaposed layers of sheet material using an ultrasonically resonant resonator operating in conjunction with a patterned anvil drum, and the use of a second drum operating in conjunction with the anvil drum, the second drum having a patterned cutting surface substantially identical with the pattern of the anvil drum for severing the joined portions joined in accordance with such pattern from the surrounding sheet material.

The use of patterned anvil drums in conjunction with one or more ultrasonic resonators for joining sheet material in accordance with a predetermined pattern is well known in the art, see for instance, U.S. Pat. No. 3,733,238 issued to D. D. Long et al dated May 15, 1973, and U.S. Pat. No. 4,430,148 issued to J. E. Schaefer dated Feb. 7, 1984. The raised pattern on the anvil drum establishes the location at which the sheet material is joined and generally is configured to provide a pleasing appearance.

U.S. Pat. No. 3,562,041 issued to C. A. Robertson and dated Feb. 9, 1971 shows an arrangement wherein a drum (FIG. 4) along its periphery is provided with pattern flanges. Each pattern flange is exposed to the action of an ultrasonically vibrating resonator to cause the joining of textile sheet material interposed between the resonant output surface of the resonator and the raised surface of the pattern flange. The patent illustrates, as an example, the manufacture of shirt sleeve cuffs. The joined material, such as a shirt sleeve cuff, is severed from the surrounding material at a subsequent and separate shearing station having a shearing tool.

The use of a separate shearing station for cutting the joined sheet material from the surrounding material is obviated in an arrangement as disclosed in U.S. Pat. No. 3,939,033 issued to F. Grgach et al dated Feb. 17, 1976. In this patent, the drum is provided with raised surfaces acting as welding surfaces but, in addition, cutting surfaces are provided adjoining the welding surfaces, the cutting surfaces being raised slightly above the level of the welding surfaces. As a result, sheet material fed through the nip between the output surface of the resonator and the drum is sealed and cut simultaneously in a single pass through the nip. A second, separate shearing station is obviated. Practice has shown that in the latter arrangement the cutting surface is subject to wear due to the repetitive high impact force of the resonator upon the relatively narrow and sharp cutting surface. Depending upon the application and material, wear may occur very quickly, thus rendering the apparatus inoperative after only a few hours of use.

The present invention concerns an improved arrangement, utilizing a two-drum arrangement, the drums rotating against one another. A first drum is provided with raised surfaces corresponding to the pattern along which sheet material fed through the nip between the output surface of a resonator and the first drum is to be joined. A second drum rotating against the first drum is provided with raised cutting surfaces which correspond, at least in part, to the pattern on the first drum. As the joined sheet material exits from the nip between the resonator and first drum, the material is fed around the first drum to a second nip formed between the first drum and the second drum, and as the material is fed through the second nip, the material is cut by the coaction between the pattern on the first drum and the confronting cutting pattern surfaces on the second drum. Thus, the cutting surface is not subjected to the impact of the resonator output surface. By providing the welding surface of the first drum with a recess or groove which meshes with the front of the cutting surface of the second drum, the interposed sheet material is securely severed from the surrounding material.

One of the principal objects of this invention is the provision of a new and improved apparatus for ultrasonically joining juxtaposed layers of sheet material and for subsequently severing the joined material from the surrounding material.

Another important object of this invention is the provision of new and improved apparatus for ultrasonically joining and severing sheet material using a first drum for joining sheet material in accordance with a predetermined pattern and a second drum for severing the joined material from the surrounding waste material.

Another important object of this invention is the provision of an apparatus for joining juxtaposed layers of sheet material using an ultrasonic resonator operating in conjunction with a first drum having a pattern of welding surfaces along its surface, and a second drum coacting with the first drum having a pattern of cutting surfaces confronting the pattern of welding surfaces whereby as the drums rotate against each other the welded material is cut in response to the welded sheet material being fed through the nip between the first and second drums.

A further important object of this invention is the provision of an ultrasonic seal and cut apparatus for sheet material, the apparatus not being subject to excessive wear and thus providing high reliability and long life.

Still other and further objects of this inventions will become more clearly apparent by reference to the following description when read in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic elevational view of the apparatus comprising the present invention;

FIG. 2 is a side view of the apparatus, and

FIG. 3 is an enlarged view showing the confronting welding and cutting surfaces.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the figures and FIGS. 1 and 2 in particular, numerals 10 and 12 refer to a set of rotatably mounted drums which rotate against each other in synchronism by being driven from drive means 14 through mechanical means 16 and 18. Drum 10 is provided along its surface with a pattern of raised welding surfaces 20, in the present example annular surfaces, to produce, for instance, filter disks welded together at the periphery. A complementary pattern of cutting surfaces 22 is provided on the surface of drum 12, and both patterns and drums are arranged to cause a respective welding surface pattern portion of the drum 10 to be in confronting relationship with a respective cutting surface pattern portion 22 of the drum 12 as the drums 10 and 12 rotate in synchronism responsive to the operation of the drive means 14.

A resonator or horn 24 dimensioned to be resonant at a predetermined ultrasonic frequency has an output surface 26 which is disposed in confronting relationship with the surface of drum 10. The resonator typically is constructed as shown in the patent of Robertson supra and U.S. Pat. No. 3,113,225 issued to C. Kleesattel et al dated Dec. 3, 1963. Resonators of this type are well known in the art and commonly referred to as blade shaped resonators. Resonators of this type are either used singly or in an array when wide sheet material is to be welded, see the patent to Long et al supra. The output surface 26 together with the surface of the drum 10 form a nip through which juxtaposed layers of sheet material M are fed. To effect joining of sheet material, it is necessary that at least one of the superposed layers of sheet material contains thermoplastic material. When the resonator 24 is rendered resonant at an ultrasonic frequency and the output surface 26 undergoes excursion toward and away from the surface of the roller 10, the sheet material M is fed through the nip between the roller and resonator. The raised welding surfaces 20 form anvil surfaces for the sheet material. Responsive to the dissipation of ultrasonic energy in the layers of material, the layers are joined in accordance with the pattern of welding surfaces 20 as amply described in the prior art. For rendering the resonator resonant, the resonator is coupled to an electroacoustic converter which is energized with electrical energy from an electrical high frequency generator, see Kleesattel et al supra.

In the present apparatus, after being fed through the nip between the resonator 24 and drum 10, the material M is fed around the surface of the drum 10 to a second nip formed between the drums 10 and 12, see FIG. 2. As the material is fed through this second nip, the joined and welded material is cut by the coaction of the confronting welding surfaces 20 on drum 10 and the cutting surfaces 22 on drum 12. The severed pieces M1, in the present example, fall into a receptacle 30.

FIG. 3 depicts a typical and preferred embodiment of the welding and cutting surfaces disposed about the surface of the respective drums and illustrates the coaction of such surfaces. Numeral 20' denotes a portion of the welding surface pattern which is in confronting relationship with a portion 22' of the cutting surface pattern. The raised flat welding surface is provided with a groove 21, typically centrally disposed relative to the width of the welding surface. In a complementary manner, the cutting surface 22' is shaped to present a cutting edge entering the groove 21. With the sheet material M interposed therebetween, a cutting action occurs for effecting a severing of the joined material M. Importantly, in the arrangement shown, the cutting surface is not subjected to a repetitive high g force impact by the ultrasonic resonator and, therefore, the cutting surface is retained sharp for an extended period of time.

In an alternative embodiment, the groove 21 may be disposed at the outer edge of the welding surface.

As a result of the use of two complementary drums, the process of joining and severing sheet material is accomplished in a smooth and continuous manner. It will be apparent, moreover, that during operation respective portions of the welding surface pattern 20 on drum 10 must become disposed opposite complementary portions of the cutting surface pattern 22 on drum 12 so that the patterns mesh in the manner illustrated. Synchronized rotation of both drums is accomplished by the drive mechanism 14.

While there have been described and illustrated a preferred embodiment of the invention and certain alternative embodiments thereof, it will be apparent to those skilled in the art that various further changes and modifications may be made without departing from the principle of this invention which shall be limited only by the scope of the appended claims.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3562041 *Oct 26, 1967Feb 9, 1971Cavitron CorpMethod and apparatus for the ultrasonic joining of materials according to a pattern
US3733238 *Dec 13, 1971May 15, 1973Crompton & Knowles CorpApparatus for vibration welding of sheet materials
US3749626 *Jun 28, 1971Jul 31, 1973Buck HRotary die apparatus and process for manufacturing labels or the like
US3939033 *Dec 16, 1974Feb 17, 1976Branson Ultrasonics CorporationUltrasonic welding and cutting apparatus
US4430148 *Apr 27, 1982Feb 7, 1984The Procter & Gamble CompanyUltrasonic bonding apparatus
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5057182 *Jan 19, 1990Oct 15, 1991Sonokinetics GroupUltrasonic comb horn and methods for using same
US5171387 *May 10, 1991Dec 15, 1992Sonokinetics GroupUltrasonic comb horn and methods for using same
US5368464 *Dec 31, 1992Nov 29, 1994Eastman Kodak CompanyUltrasonic apparatus for cutting and placing individual chips of light lock material
US5403415 *Nov 17, 1993Apr 4, 1995Abaxis, Inc.Method and device for ultrasonic welding
US5435863 *Mar 31, 1994Jul 25, 1995Branson Ultrasonics CorporationMethod for processing workpieces by ultrasonic energy
US5512132 *Sep 19, 1994Apr 30, 1996Eastman Kodak CompanyMethod for cutting and placing individual chips of light lock material
US5599411 *Dec 6, 1994Feb 4, 1997Abaxis, Inc.Method and device for ultrasonic welding
US5658408 *Jul 24, 1995Aug 19, 1997Branson Ultrasonics CorporationMethod for processing workpieces by ultrasonic energy
US5719100 *Mar 20, 1992Feb 17, 1998Zahradnik; RudolfMixture of sodium chlorite and acid activator; stability; portability
US5733411 *Dec 21, 1995Mar 31, 1998Kimberly-Clark CorporationUltrasonic system
US5735984 *Sep 23, 1996Apr 7, 1998Minnesota Mining And Manufacturing CompanyPlacing sheet on patterned anvil, subjecting to sonic vibrations
US5846377 *Jul 14, 1997Dec 8, 1998Branson Ultrasonics CorporationMethod for processing workpieces by ultrasonic energy
US5855706 *Apr 29, 1997Jan 5, 1999Branson Ultrasonics CorporationSimultaneous amplitude and force profiling during ultrasonic welding of thermoplastic workpieces
US5871605 *Jan 9, 1998Feb 16, 1999Kimberly-Clark Worldwide, Inc.Ultrasonic system and method
US5879494 *Mar 20, 1998Mar 9, 1999Minnesota Mining And Manufacturing CompanyMethod of aperturing thin sheet materials
US5985065 *Nov 26, 1996Nov 16, 1999Sca Hygiene Products AbMethod of welding or cutting material ultrasonically
US6117059 *Nov 7, 1998Sep 12, 2000Branson Ultrasonics CorporationMethod of manufacturing a filtration bag
US6120629 *Aug 15, 1997Sep 19, 2000Tyco International (Us) Inc.Ultrasonic processing
US6451205 *Apr 5, 2000Sep 17, 2002Filtertek Inc.Filter manufacturing process using a combined welding and cutting step
US6749102 *Jun 20, 2002Jun 15, 2004Sumitomo Wiring Systems, Ltd.Ultrasonic welding and cutting device for use in the manufacture of a flat cable
US7083722Sep 13, 2002Aug 1, 2006Filtertek Inc.Filter manufacturing process using a combined welding and cutting step
US7204899Apr 30, 2003Apr 17, 2007Kimberly-Clark Worldwide, Inc.Apparatus and method for mechanically bonding and cutting an article
US7285447Jun 25, 2003Oct 23, 2007Intel CorporationMethod and apparatus for imprinting a circuit pattern using ultrasonic vibrations
US7341084Feb 22, 2007Mar 11, 2008Kimberly-Clark Worldwide, Inc.Apparatus for mechanically bonding and cutting an article
US8172971 *Mar 2, 2010May 8, 2012Uni-Charm CorporationJoining apparatus and method of manufacturing absorbent article
US8440033 *Jun 22, 2010May 14, 2013New Century Membrane Technology Co., Ltd.Method and apparatus for making a filtering unit
US8550138 *Jul 17, 2012Oct 8, 2013New Century Membrane Technology Co., Ltd.Apparatus for making a filtering unit
US20100218881 *Mar 2, 2010Sep 2, 2010Uni-Charm CorporationJoining apparatus and method of manufacturing absorbent article
US20110308699 *Jun 22, 2010Dec 22, 2011Chi-Chang KuoMethod and Apparatus for Making a Filtering Unit
US20120279663 *Jul 17, 2012Nov 8, 2012Chi-Chang KuoApparatus for Making a Filtering Unit
CN1061292C *Jan 27, 1995Jan 31, 2001铃木三次Apparatus for adhering and cutting synthetic resin packaging material
EP0908293A1 *Oct 7, 1998Apr 14, 1999Seb S.A.Process for joining a rigid plastics piece with a flexible film on a drum
EP0916476A1 *Oct 13, 1998May 19, 1999SCHOBER GmbH Werkzeug- und MaschinenbauApparatus and process for joining filtermaterial by ultrasonics
Classifications
U.S. Classification156/510, 493/202, 156/580.2, 156/582, 156/73.1, 493/197
International ClassificationB29C65/74, B26F1/08, B26F1/38, B29C65/08, B26F1/00, A41D27/24
Cooperative ClassificationB29C65/7435, B29C2793/0009, B29C66/83511, B29C66/1122, B29C66/43, A41D27/245, B29C66/83413, B29C66/81427, B29C65/086, B29C65/7441, B29C65/7443
European ClassificationB29C65/08, B29C65/7443, B29C65/7435, B29C65/7441, B29C66/83511, A41D27/24B
Legal Events
DateCodeEventDescription
Nov 14, 1995FPExpired due to failure to pay maintenance fee
Effective date: 19950906
Sep 3, 1995LAPSLapse for failure to pay maintenance fees
Apr 11, 1995REMIMaintenance fee reminder mailed
Nov 13, 1990FPAYFee payment
Year of fee payment: 4
Oct 24, 1986ASAssignment
Owner name: BRANSON ULTRASONICS CORPORATION, EAGLE ROAD, DANBU
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FLOOD, GARY N.;REEL/FRAME:004624/0198
Effective date: 19861016